Hi,
On 2020-03-10 00:46, jimlux wrote:
> On 3/9/20 2:36 PM, Poul-Henning Kamp wrote:
>>
>> In message <3899483.rfyw6ut...@linux-5fgm.suse>, Matthias Welwarsky
>> writes:
>>
>>> I've actually been thinking of using a Kalman filter to find the
>>> "true value"
>>> of the EFC. I just couldn'
Hi,
On 2020-03-09 22:31, Poul-Henning Kamp wrote:
>
> In message <20200309222553.e5b65b79daa2ee195cf13...@kinali.ch>, Attila Kinali
> writes:
>> On Mon, 09 Mar 2020 13:44:59 +
>> "Poul-Henning Kamp" wrote:
>>
>>> I'm thinking 24h (to minimize GPS periodicities) frequency measurement
Hi,
You probably want a long-time-constant steering of the FLL from the
phase, to make sure any residue frequency offsets and low-frequency
parts keeps the phase-control within range.
Cheers,
Magnus
On 2020-03-09 15:04, Bob kb8tq wrote:
> Hi
>
> If you go that way, just run a pure FLL for the “m
On 3/9/20 2:36 PM, Poul-Henning Kamp wrote:
In message <3899483.rfyw6ut...@linux-5fgm.suse>, Matthias Welwarsky writes:
I've actually been thinking of using a Kalman filter to find the "true value"
of the EFC. I just couldn't wrap my mind around the theory yet.
Yeah, they are hard to
On Montag, 9. März 2020 22:45:28 CET Attila Kinali wrote:
> [1] "Kalman Filtering", by Dan Simon, 2001
> http://aug-roma.wdfiles.com/local--files/progetti:arpinpero/Kalman_filtering
> .pdf
Nice. Particularly, since the chosen example is vehicle cruise control, which
is pretty much what a GPSDO do
On Mon, 09 Mar 2020 22:33:32 +0100
Matthias Welwarsky wrote:
> I've actually been thinking of using a Kalman filter to find the "true value"
> of the EFC. I just couldn't wrap my mind around the theory yet.
If you are not afraid of matrices and linear algebra, than I found
that [1] is a good in
On Mon, 09 Mar 2020 21:31:00 +
"Poul-Henning Kamp" wrote:
> >Please correct me if I'm wrong, but that sounds like a
> >simplified version of a Kalman filter, with the only
> >predicted variable being the frequency of the LO.
>
> I think this has many names.
Definitely. If you leave out the
In message <3899483.rfyw6ut...@linux-5fgm.suse>, Matthias Welwarsky writes:
>I've actually been thinking of using a Kalman filter to find the "true value"
>of the EFC. I just couldn't wrap my mind around the theory yet.
Yeah, they are hard to get started with, there seems to be only two
On Montag, 9. März 2020 22:25:53 CET Attila Kinali wrote:
> On Mon, 09 Mar 2020 13:44:59 +
>
> "Poul-Henning Kamp" wrote:
> > I'm thinking 24h (to minimize GPS periodicities) frequency measurement
> > and adjustment, with a continuous very weak proportional phase adjustment
> > to come with m
In message <20200309222553.e5b65b79daa2ee195cf13...@kinali.ch>, Attila Kinali
writes:
>On Mon, 09 Mar 2020 13:44:59 +
>"Poul-Henning Kamp" wrote:
>
>> I'm thinking 24h (to minimize GPS periodicities) frequency measurement
>> and adjustment, with a continuous very weak proportional ph
On Mon, 09 Mar 2020 13:44:59 +
"Poul-Henning Kamp" wrote:
> I'm thinking 24h (to minimize GPS periodicities) frequency measurement
> and adjustment, with a continuous very weak proportional phase adjustment
> to come with measurement noise and rounding errors ?
Please correct me if I'm wrong
In message <4892914a-b4d6-47a6-9b10-eb18376fc...@n1k.org>, Bob kb8tq writes:
>Hi
>
>In this case the “phase” is phase correction of the output rather than PLL ….
And a much smaller phase correction, because it is not trying to also
steer the frequency.
--
Poul-Henning Kamp | UNIX
Hi
In this case the “phase” is phase correction of the output rather than PLL ….
Bob
> On Mar 9, 2020, at 10:58 AM, Matthias Welwarsky
> wrote:
>
> On Montag, 9. März 2020 15:04:40 CET Bob kb8tq wrote:
>> Hi
>>
>> If you go that way, just run a pure FLL for the “main loop” and do the phase
>
Hi;
If no one else has asked I would be interest and glad to cover shipping. I have
two that have electrical issues, but may have good tubes.
Thanks;
Tom Knox
SR Test and Measurement Engineer
Ascent Concepts and Technology
4475 Whitney Place
Boulder Colorado 80305
303-554-0307
act...@hotmai
On Montag, 9. März 2020 15:04:40 CET Bob kb8tq wrote:
> Hi
>
> If you go that way, just run a pure FLL for the “main loop” and do the phase
> on top of that. Assuming you are disciplining an OCXO, it works pretty well
> …. Even more so if you keep time tagged phase ( to do frequency from phase)
>
On Montag, 9. März 2020 14:44:59 CET Poul-Henning Kamp wrote:
>
>
> In message <1593455.ijmom2w...@linux-5fgm.suse>, Matthias Welwarsky writes:
> >> Backing up a bit …. the objective is not to minimize overshoot or
> >> keep the loop from oscillating. The issue here is optimizing the nois
Hi,
Over the last weekend, I took apart an HP5071A with a high performance tube
option. The tube was entirely exhausted but as far as I am aware, other
components are still in good shape. I'm keeping the front panel, CBT, and an
oven oscillator but other parts are available. If someone needs
Hi
If you go that way, just run a pure FLL for the “main loop” and do the phase
on top of that. Assuming you are disciplining an OCXO, it works pretty well ….
Even more so if you keep time tagged phase ( to do frequency from phase)
and can look at some very long tau “frequency” as a section of th
On Samstag, 7. März 2020 15:35:22 CET Tobias Pluess wrote:
> Hi,
> I am sure it is theoretically possible to find an optimal control loop
> design if you have accurate models of the OCXO and for the behaviour of the
> 1PPS pulse.
> TvB has written a GPSDO simulator which allows to code different PL
In message <1593455.ijmom2w...@linux-5fgm.suse>, Matthias Welwarsky writes:
>> Backing up a bit …. the objective is not to minimize overshoot or
>> keep the loop from oscillating. The issue here is optimizing the noise
>> output of the combination of GPS + OCXO when combined via
>> the co
On Sonntag, 8. März 2020 02:08:25 CET Bob kb8tq wrote:
> Hi
>
> Backing up a bit …. the objective is not to minimize overshoot or
> keep the loop from oscillating. The issue here is optimizing the noise
> output of the combination of GPS + OCXO when combined via
> the control loop. It’s a very dif
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